The Lions are currently in England preparing for their game against Atlanta, which will take place at London's Wembley Stadium.
Johnson returned to practice for the first time in two weeks on Wednesday and practiced with a helmet on Thursday. He thought he moved much better on Thursday:
"Things are going good," he said. "We're moving in a positive direction."
Detroit is 5-2 this season and currently sits in first place in the NFC North. The Lions have a bye after their game against the Falcons on Sunday.
Johnson has caught 22 passes for 348 yards and two touchdowns this season.
"You want to push it. I want to push it, but we're trying to be smart about it," Johnson said, according to MLive.com. "Trying to take advice from the training staff that they are giving me and go with that.